/*
 * Copyright (c) 2021 Huawei Device Co., Ltd.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef LOCK_STATUS_OBSERVER_H
#define LOCK_STATUS_OBSERVER_H

#include "notification_chain.h"
#include "runtime_context.h"

namespace DistributedDB {
class LockStatusObserver final {
public:
    LockStatusObserver();
    ~LockStatusObserver();
    DISABLE_COPY_ASSIGN_MOVE(LockStatusObserver);
    int Start();
    void Stop();
    void OnStatusChange(bool isLocked) const;
    bool IsStarted() const;
    NotificationChain::Listener *RegisterLockStatusChangedLister(const LockStatusNotifier &action, int &errCode) const;

private:
    static const EventType LOCK_STATUS_CHANGE_EVENT = 2;
    int PrepareNotifierChain();
    NotificationChain *lockStatusChangedNotifier_;
    bool isStarted_;
};
}

#endif
